Genetic variant analysis (SNV) for a specific DNA sequence (e.g., dbSNP reference version)

What This Test Measures

This test examines differences in a single nucleotide (a single DNA building block) across a specific DNA sequence, compared to a baseline reference (e.g., dbSNP database). It detects whether a particular variant is present in your DNA. Unlike routine blood or urine tests, this is a genetic analysis, not a blood or bodily fluid sample.

Why It Might Be Ordered

Healthcare providers may order this test for research studies, genetic counseling, or specialized genetic testing (e.g., carrier screening, inherited conditions, or pharmacogenomics). It’s not typically part of standard medical testing for general health monitoring.

Sample Collection and Process

To perform this test, a small amount of DNA is extracted from a blood sample, saliva sample, or buccal swab (cheek cell sample). The DNA is then analyzed for the specific genetic variants listed in the reference database. Results are compared to the reference sequence to identify any differences.

What to Expect Before the Test

No special preparation is usually needed. If a blood sample is used, you may fast or avoid certain medications as directed by your provider. If a saliva or swab sample is used, simply collect the sample at home and return it to the lab.